TFA9842AJ

Manufacturer Part NumberTFA9842AJ
Description7.5W Stereo Power Amplifier
ManufacturerPhilips
TFA9842AJ datasheet
 


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TFA9842AJ
7.5 W stereo power amplifier with volume control
Rev. 01 — 28 April 2006
1. General description
The TFA9842AJ contains two identical audio power amplifiers. The TFA9842AJ can be
used as two Single-Ended (SE) channels with a volume control. The maximum gain is
26 dB.
The TFA9842AJ comes in a 9-pin DIL-bent-SIL (DBS9P) power package. The TFA9842AJ
is pin compatible with the TFA9843AJ, TFA9843(B)J, TFA9842(B)J and TFA9841J. The
difference between the TFA9843AJ and the TFA9843(B)J, TFA9842(B)J, TFA9841J is the
functionality of pin 7. The TFA9843AJ has a Volume Control (VC) on pin 7. The
TFA9843(B)J, TFA9842(B)J and TFA9841J have a mode select (MODE) on pin 7.
The TFA9842AJ contains a unique protection circuit that is solely based on multiple
temperature measurements inside the chip. This gives maximum output power for all
supply voltages and load conditions with no unnecessary audio holes. Almost any supply
voltage and load impedance combination can be made as long as thermal boundary
conditions (number of channels used, external heatsink and ambient temperature) allow
it.
2. Features
I
2 channel SE: 1 W to 7.5 W operation possibility
I
Soft clipping
I
Input clamps
I
Volume control
I
Standby and Mute mode
I
No on or off switching plops
I
Low standby current
I
High supply voltage ripple rejection
I
Outputs short-circuit protected to ground, supply and across the load
I
Thermally protected
I
Pin compatible with the TFA9843AJ, TFA9843(B)J, TFA9842(B)J and TFA9841J
3. Applications
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CRT TV and LCD TV
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Monitors
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PC speakers
I
Boom box
I
Mini and micro audio receivers
Preliminary specification

TFA9842AJ Summary of contents

  • Page 1

    ... The TFA9843AJ has a Volume Control (VC) on pin 7. The TFA9843(B)J, TFA9842(B)J and TFA9841J have a mode select (MODE) on pin 7. The TFA9842AJ contains a unique protection circuit that is solely based on multiple temperature measurements inside the chip. This gives maximum output power for all supply voltages and load conditions with no unnecessary audio holes ...

  • Page 2

    ... V. and an amplitude of 300 mV (RMS), which is applied to the positive supply rail. ripple Ordering information Package Name Description DBS9P plastic DIL-bent-SIL power package; 9 leads (lead length 12/11 mm); exposed die pad Rev. 01 — 28 April 2006 TFA9842AJ Min Typ Max [ 100 ...

  • Page 3

    ... V REF 7 VOLUME VC CONTROL TFA9842AJ 5 GND IN2 1 OUT2 2 3 CIV 4 IN1 TFA9842AJ 5 GND SVR OUT1 Rev. 01 — 28 April 2006 TFA9842AJ 8 OUT1 2 OUT2 AND TEMPERATURE PROTECTION SVR 001aae064 001aae063 © Koninklijke Philips Electronics N.V. 2006. All rights reserved ...

  • Page 4

    ... This results in a good low frequency response and good switch-on behavior. The TFA9842AJ has clamps on the inputs. In Standby mode the voltage on the input pins is clamped for voltages lower than 0.1 V. When the TFA9842AJ is in Mute, Volume control or Operating mode (maximum gain) the input clamp voltage (RMS). 8.2 Power amplifi ...

  • Page 5

    ... For the average listening level a power dissipation of 4.2 W can be used for a heatsink calculation. Table 4. Headroom 8.3 Mode selection The TFA9842AJ has four functional modes, which can be selected by applying the proper DC voltage to pin VC (see Table 5. V I(VC 0 1 ...

  • Page 6

    ... This can result in repetitive switching during too high junction temperature. This protects the TFA9842AJ against short-circuits to ground, to the supply voltage, across the load and too high chip temperatures. The protection will only be activated when necessary, so even during a short-circuit condition, a certain amount of (pulsed) current will still fl ...

  • Page 7

    ... Hz to ripple 20 kHz mute output voltage channel separation maximum voltage gain difference = 0 S Rev. 01 — 28 April 2006 TFA9842AJ ; measured in test circuit of i Min Typ Max [ 100 - - 150 [ ...

  • Page 8

    ... V (V) I(VC) Fig 4. Output power (one channel function of 001aaa419 10 THD N (%) ( Fig 6. Total harmonic distortion-plus-noise as a Rev. 01 — 28 April 2006 TFA9842AJ = 0 S 001aaa445 THD = 10 % supply voltage for various SE loads 001aaa446 ...

  • Page 9

    ... W stereo power amplifier with volume control 001aaa447 (V) CC Fig 8. Total power dissipation as a function of channel 001aaa423 SVRR (Hz) Fig 10. Supply voltage ripple rejection as a function of Rev. 01 — 28 April 2006 TFA9842AJ ( SE ...

  • Page 10

    ... IN1 220 nF IN2 CIV VOLUME CONTROL MICRO- CONTROLLER TFA9842AJ 5 GND Rev. 01 — 28 April 2006 TFA9842AJ 100 nF 8 OUT1 1000 F OUT2 2 1000 F SHORT-CIRCUIT AND TEMPERATURE V REF PROTECTION SVR 150 F 001aae065 © Koninklijke Philips Electronics N.V. 2006. All rights reserved. ...

  • Page 11

    ... 5 GND PWM T2 3 PWM 001aae338 PWM Rev. 01 — 28 April 2006 TFA9842AJ 001aae337 Fig 14. Volume control drive circuit with potentiometer © ...

  • Page 12

    ... CIV 22 SGND F CIV IN2 = 60 C (example and (SE 150 C (specification) is the total thermal resistance between the junction and the ambient including the Rev. 01 — 28 April 2006 TFA9842AJ / TVA 100 nF 1000 F 220 nF 150 F MODE ...

  • Page 13

    ... K/W th(tot) th(j-mb) 150 100 loads external heatsink of 10 K/W; music signals amb Rev. 01 — 28 April 2006 TFA9842AJ 2.0 K/W = 8.7 K/W Section 8.2.2). This allows for 2.0 K/W = 19.4 K/W 001aaa449 (V) CC © Koninklijke Philips Electronics N.V. 2006. All rights reserved ...

  • Page 14

    ... 14.7 3 12.4 11.4 3.5 3.5 2.54 1.27 5.08 14.3 2 11.0 10.0 REFERENCES JEDEC JEITA Rev. 01 — 28 April 2006 TFA9842AJ view B: mounting base side 6.7 4.5 3 ...

  • Page 15

    ... For PMFP packages hot bar soldering or manual soldering is suitable. TFA9842AJ_1 Preliminary specification 7.5 W stereo power amplifier with volume control Suitability of through-hole mount IC packages for dipping and wave soldering methods [2] Rev. 01 — 28 April 2006 TFA9842AJ stg(max) Soldering method Dipping Wave - suitable [1] ...

  • Page 16

    ... Revision history Document ID Release date TFA9842AJ_1 20060428 TFA9842AJ_1 Preliminary specification 7.5 W stereo power amplifier with volume control Data sheet status Change notice Preliminary data sheet - Rev. 01 — 28 April 2006 TFA9842AJ Supersedes - © Koninklijke Philips Electronics N.V. 2006. All rights reserved ...

  • Page 17

    ... Trademarks Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. Rev. 01 — 28 April 2006 TFA9842AJ © Koninklijke Philips Electronics N.V. 2006. All rights reserved ...

  • Page 18

    ... Please be aware that important notices concerning this document and the product(s) described herein, have been included in section ‘Legal information’. © Koninklijke Philips Electronics N.V. 2006. For more information, please visit: http://www.semiconductors.philips.com. For sales office addresses, email to: sales.addresses@www.semiconductors.philips.com. Document identifier: TFA9842AJ_1 All rights reserved. Date of release: 28 April 2006 ...